mirror of
https://github.com/netsurf-browser/netsurf
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91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Generic bitmap handling (interface).
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*
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* This interface wraps the native platform-specific image format, so that
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* portable image convertors can be written.
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*
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* Bitmaps are required to be 32bpp with components in the order RR GG BB AA.
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*
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* For example, an opaque 1x1 pixel image would yield the following bitmap
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* data:
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*
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* Red : 0xff 0x00 0x00 0x00
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* Green: 0x00 0xff 0x00 0x00
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* Blue : 0x00 0x00 0xff 0x00
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*
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* Any attempt to read pixels by casting bitmap data to uint32_t or similar
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* will need to cater for the order of bytes in a word being different on
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* big and little endian systems. To avoid confusion, it is recommended
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* that pixel data is loaded as follows:
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*
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* uint32_t read_pixel(const uint8_t *bmp)
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* {
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* // red green blue alpha
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* return bmp[0] | (bmp[1] << 8) | (bmp[2] << 16) | (bmp[3] << 24);
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* }
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*
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* and *not* as follows:
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*
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* uint32_t read_pixel(const uint8_t *bmp)
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* {
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* return *((uint32_t *) bmp);
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* }
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*/
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#ifndef _NETSURF_IMAGE_BITMAP_H_
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#define _NETSURF_IMAGE_BITMAP_H_
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#include <stdbool.h>
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#include <stdlib.h>
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#define BITMAP_NEW 0
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#define BITMAP_OPAQUE (1 << 0) /** image is opaque */
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#define BITMAP_MODIFIED (1 << 1) /** buffer has been modified */
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#define BITMAP_PERSISTENT (1 << 2) /** retain between sessions */
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#define BITMAP_CLEAR_MEMORY (1 << 3) /** memory should be wiped */
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#define BITMAP_SUSPENDED (1 << 4) /** currently suspended */
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#define BITMAP_READY (1 << 5) /** fully initialised */
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#define BITMAP_SAVE_FULL_ALPHA (1 << 0) /** save with full alpha channel (if not opaque) */
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struct content;
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/** An opaque image. */
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struct bitmap;
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void *bitmap_create(int width, int height, unsigned int state);
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void bitmap_set_opaque(void *bitmap, bool opaque);
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bool bitmap_test_opaque(void *bitmap);
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bool bitmap_get_opaque(void *bitmap);
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unsigned char *bitmap_get_buffer(void *bitmap);
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size_t bitmap_get_rowstride(void *bitmap);
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size_t bitmap_get_bpp(void *bitmap);
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void bitmap_destroy(void *bitmap);
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bool bitmap_save(void *bitmap, const char *path, unsigned flags);
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void bitmap_modified(void *bitmap);
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void bitmap_set_suspendable(void *bitmap, void *private_word,
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void (*invalidate)(void *bitmap, void *private_word));
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int bitmap_get_width(void *bitmap);
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int bitmap_get_height(void *bitmap);
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#endif
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